2.6.32-stable review patch. If anyone has any objections, please let us know.

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From: Ben Hutchings <ben@decadent.org.uk>

commit 8faf2e6c201d95b780cd3b4674b7a55ede6dcbbb upstream.

Several MIPS platforms don't set pci_controller::io_map_base for theirPCI bridges. This results in a panic in pci_iomap(). (The panic isconditional on CONFIG_PCI_DOMAINS, but that is now enabled for all PCIMIPS systems.)